Time-frequency synchronous method for receiving data in short distance radio network
A short-range wireless, data-receiving technology, used in synchronization devices, synchronization/start-stop systems, digital transmission systems, etc., and can solve problems such as large amounts of computation
Inactive Publication Date: 2006-08-23
BEIJING TRANSPACIFIC IP TECH DEV
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However, because the phase estimation interval is -π~π, this method can only estimate -1 / 2T s ~1 / 2T s frequency offset between, here T s is the period of the spreading sequence
For frequency offsets beyond this range, the traditional GPS uses a time-frequency two-dimensional search method to perform sliding correlation in the time domain and frequency domain, and estimate the synchronization point of time and frequency according to the peak value of all correlation values. This method is relatively accurate to achieve time-frequency synchronization, but the amount of calculation is too large
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[0023] The time-frequency synchronization method for data reception in the short-range wireless network proposed by the present invention, and its flow chart is as follows figure 1 As shown, the radio frequency signal sent in the short-range wireless network is first received, down-converted, and sampled with a period T to obtain the baseband digital received signal. Take two consecutive segments of the received sequence of length N in the baseband digital received signal and denote them as R 1 , R 2 , Where N=T s / T, T s Is the time period of the symbol of the baseband digital received signal, and T is the sampling period; conjugate correlation is performed on the above two received sequences to obtain the conjugate correlation value ρ = Σ n = 0 N - 1 R 2 [ n ...
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Present invention relates to a time frequently synchronizing method for receiving data short distance wireless networks, belonging to wireless communication technology field. It contains receiving RF transmitted signal, frequency conversion and sampling to become baseband receiving signal, utilizing training sequence periodicity to estimate code element cycle reciprocal decimals times frequency offset, according to real system frequency deviation region to determine the value taking possibility for code element cycle reciprocal integral multiple frequency offset, according to each hypotheses possible frequency offset to proceed frequency offset compensation to receiving signal, then to proceed sliding correlation with local sequence, according to correlative maximum value to determine frequency offset estimated value and time synchronizing position, thereby realizing time frequently combined synchronizing position. Said method reduces calculated amount in time and frequency synchronism, to make receiver having more low power consumption.
Description
Technical field [0001] The invention relates to a time-frequency synchronization method for receiving data in a short-range wireless network, in particular to a time synchronization and frequency synchronization method in a short-range wireless network, and belongs to the technical field of wireless communication. Background technique [0002] Modern wireless network communication is mostly packet transmission, that is, only one data packet is transmitted between the transceivers at a time, and the time and frequency must be synchronized between the transceivers before each data transmission starts. In a spread-spectrum-based system, time synchronization should find the boundary of the spread-spectrum sequence and the optimal sampling time of each element in the sequence corresponding to the pulse. The frequency synchronization is to keep the carrier frequency of the receiving end and transmitting end consistent to eliminate the influence of frequency offset on data demodulation....
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IPC IPC(8): H04L25/38H04L7/00
Inventor 刘婷婷田亚飞张良杨晨阳郦亮
Owner BEIJING TRANSPACIFIC IP TECH DEV